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Spin Rotation Induced by Applied Pressure in Cd-Doped Ce2RhIn8 Intermetallic Compound

Published

Author(s)

D. S. Christovam, C. Giles, L. Mendonca-Ferreira, Juscelino Leao, William D. Ratcliff, Jeffrey W. Lynn, S. Ramos, E. N. Hering, H. Hidaka, E. Baggio-Saitovich, Z. Fisk, P. G. Pagliuso, C. Adriano

Abstract

The pressure evolution of the magnetic properties of the Ce2RhIn7.79Cd0.21 heavy fermion compound was investigated by single crystal neutron magnetic diffraction and electrical resistivity experiments under applied pressure. From the neutron magnetic diffraction data, up to P=0.6 GPa, we found no changes in the magnetic structure nor in the ordering temperature TN = 4.8 K. However, the increase of pressure induces an interesting spin rotation of the ordered antiferromagnetic moment of the Ce2RhIn7.79Cd0.21 into the ab tetragonal plane. From the electrical resistivity measurements under pressure, we have mapped the evolution of TN and the maximum of the temperature dependent electrical resistivity (TMAX) as a function of the pressure (P<3.6 GPa). To gain some insight into the microscopic origin of the observed spin rotation as a function of pressure, we have also analyzed some macroscopic magnetic susceptibility data at ambient pressure for pure and Cd-doped Ced^RhIn8 using a mean field model including tetragonal crystalline electric field (CEF). The analysis indicates that these compounds have a Kramers double Gamma}17-type ground state, followed by a Γ27% first excited state at {Δ}d1^ ~80 K and a Γ6 second excited state at {Δ}2 ~270 K for Ced2^RhIn8 and {Δ}2 ~ 250 K for Ce2RhIn7.79Cd0.21. The evolution of the magnetic properties of Ced2^RhIn8 as a function of Cd-doping and the rotation of the direction of the ordered moment for the Ce2RhIn7.79Cd.0.21 compound under pressure suggest important changes of the single ion anisotropy of Ce3+ induced by applying pressure and Cd-doping in these systems. These changes are reflected in modifications in the CEF scheme that will ultimately affect the actual ground state of these compounds.
Citation
Physical Review B
Volume
100
Issue
16

Keywords

Magnetic Neutron Diffraction, Pressure Dependence, Spin rotation, heavy fermion, long range magnetic order
Created October 21, 2019, Updated December 12, 2019